Sofa



FIG. 1 is a front and right side perspective view of an exemplary sofashowing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof, the left side being amirror image; and,

FIG. 5 is a top plan view thereof.

CLAIM The ornamental design for a sofa, as shown and described.